Rotary cutting tool



Aug. 19, 1941. E HAsslG 2,253,028

ROTARY CU'IT ING TOOL Filed April 23, 1938 4 Sheets-Sheet 1 INVENTOR ATTORNEY Aug. 19, 1941. E h s; 2,253,028

ROTARY CUT'I' ING TOOL Fild April 23, 1938 4 Sheets-Sheet 2 INVENTOR.

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ATTORNEY M 19, 1941. EQHAS SIG 2,253,028 5 ROTARY CUTTING TOOL I Filed April 23, 19:58 4 sheets-sheets v ---u llllflll llllll INVENTOR ATTORNEY Aug. 19,1941. E. HASSIG 2,253,028 ROTARY CUTTING TOOL Filed April 23, 1938 4 Sheets-Sheet 4 M. w @imh ATTORNEY Patented Aug. .1

l PATENT OFFICE g 3 2,253,028

' ,noraarou'rrnve TOOL Edward Hassig, Milwaukee, Wis., assignor to Wetmore Reamer Company, Milwaukee, Wis, corporation ofwisconsin Application April 23,"1938, Serial No. 203,713 IZClaims. (01917-58) This invention relates to improvements in rotary cutting tools.

Itfis theprimary object of .the'ihventidn to provide novel. and "improved means for replaceably and .adiustablyrmountinsa cutter in awtool carrier. I

.Thelinvention.has referenceboth to new tools.

.anriato thezrepair otoldtools. .iIn repair-work it has great significance;xasrsitaenables a worn out cutter, .perhaps thaving no adjustment capable in of accuratelytpositioning 1 it :with respect to the tool body, to be w-entirely replaced with anew mounting which. is rigidly seated in the carrier, and with respect :to which ;:a :new tool *is n accurately adjustedtand'positioned;

v For example, .a boring [bar tinxan expensive machine tool may include .a tool element which has so wornthe slot in which. it is disposed as to indicate the .necessity :of :replacing not merely the tool elementbut theentireboring bar. By

3 means of thepresent invention anew mounting nmay be placedinthe boring :barand anewtool provided with micrometer: adjustment and with rigid anchorage in :the newimounting, thus saving the necessity iorzreplacing the .bar.

Another-objector the-1 invention is to provide a tool mounting of such lformzas toiacilitate zthe mac-hiningotthe baroro'therucarrler to receive the mounting.

, Still other objects include the provision of ,"means for iabsorbingnll thrusts to which the mounting issubject, thusypermitting no movement of the mounting-respecting the :bar, and

consequently avoiding any wear between these parts. 3

Other objects will-appear i from the following disclosure. 1

In; the drawingsf Figure '1 is -a view iD'iSIdGGIBVEtlOII of a tool organization embodying my .invention.

Figureiz isa viewin side elevation showing my invention embodied in asomewhat different tool construction.

Figure 3 is a' view inside elevation'of the same structure shown :in Figure 12,. the structure havnin gbeenrotated 90 from itsIFigureJ2 position.

Figure 4 is a detail view .taken'ln transverse section through the tool structure shown in Figures 2 and 3.

, Figurefi is .a detail view oiathe boring bar or carrier, showing the-opening therein to receive a substitute mounting-made in accordance with the present invention. v

Figure Bis an enlargeddetail view in perspective of the substitute mounting and the tool adsembly.

Figure 13 is a view" on a reduced scale, partially in side elevation and partally in longitudinal section, through the assembly shown in Fig ure l2.

Figures 14 and 15, respectively, represent opposite end elevations of the device shown in Figures 12 and 13.

Like parts are identified by the same reference characters throughout the several views.

Figure 1 illustrates, by way of example, some 01" the "various types of work for which my invention is adapted. In this case a spindle II is provided in the manner disclosed in my Patent No..2,096,489, with a boring tool l8 and a counter-boring tool I! operating concurrently upon the work indicated in broken lines at i8.

Secured on the spindle II, by means of the -wedgelock 20, hereinafter to be described,is a

supporting, sleeve 2| having arms 22 and 23, within :which I have illustrated tool mountings 24 held by the wedge locks 20, and each provided 5 with a separate tool operating on the work, ,the

toolZSv being shown in performance of a turning functionrand the tool 28 performing a chamfering operation.

In Figures 2 to 5 the carrier comprises a boring bar 30. This bar has originally been provided with a tool slot of the form shown in broken lines in Figure 5, and the adjustment of the tool within the slot has occasion to wear, requiring replacement.

In accordance with the present invention, the tool slot has been enlarged to the form indicated at M. It will be, noted that the sides are preferably parallel, and the ends are rounded on a radius such that the sides are tangential with reference to the 'arc oi the ends. To make such a slot it is only necessary to bore two spaced holes through the bar and to cut away the intervening material tangentially to the wallsoi the holes. In order that my mounting 24 may readily be used for replacement and repair purposes, it preferably has the form indicated in Figures 6 to 9, inclusive, or the form indicated in Figures 12 to 14, inclusive. The latter form is mounted in a single round hole, and where there is sufficient stock in the carrier this provides an even more convenient mounting.

Where the carrier stock is not adequate to permit a round hole oi suflicient size to be bored through the carrier, the flattened formshown in Figure 6 is preferred, but the mount may also be made rectangular in cross section as shown I 49 of the tool mount. The wedge is generally cylindrical in form exceptfor its tapered wedge surface 500, which is complementary to the flat portion H1 of the tool element 35. The wedge has a central opening tapped to provide threads of given pitch, and a smaller opening having threads of diflering pitch is provided. in the at 32 in Figure 11, or it may have rectangularly 1 related sides and one end rounded as shown at. 33 in Figure 10.- 1

In any case, the tool element 35 is preferably thrust transmitting flanges 4'0, whereby the reaction resulting from engagement of tool 35 with the work is transmitted directly to the carrier, independently of any securing device-s of any nature. Note that in Figures 2, 3 and 4 I have shown the carrier 30 provided at 4| with a flattened surface abutted by the flanges 40 of the mount 24,

In one of its cylindrical side portions 351 the mount is preferably provided with a flattened bearing surface. The nature of this surface will depend, naturally, on the type of means used to anchor the mount in the carrier. In the construction shown in Figures 3, 6 and '1 the cylindrical wall 36 oi the mount is notched at 43 to receive the thrust of a set screw 45, which, as shown in Figure 3, is threaded into the carrier at an angle such as to be normal to the portion of the notch engaged thereby, and to have a component of direction which draws the flanges 40 of the mount tightly into contact with the flat surface 4i of the carrier. This eliminates any play and any wear between the mount and the carrierduring the use of the tool.

The tool element 35 comprises a bar having a cutting edge 46. The mount 24 has a bore 41 in which the tool element 35 is reciprocably adjustable. Ofl center in the tool element is a tapped opening into which the adjusting screw is threaded. v

The screw 50 has a spool-shaped head, including a dial flange 5| and the positioning flange 52, the mount being provided with a channel at 53 undercut in the mount concentrically with the axis of the screw 50 to receive flange 52 when the screw is displaced from the axis of bore 41 to a position in which the screw may be engaged in the tool element, as shown in Figure, 7. The channel 53 and the thrust bearing surfaces of the flange 52 can all be accurately machined to permit of the graduated adjustment of the tool element without lost motion.

In order to fix the tool element in its adjusted position and also to maintain it against rotation at such times as it is released for radiustment, I provide the wedgelock generically des ignated by reference character 20. In the form herein disclosed, the wedge lock includes a wedge '48,, adjustably reciprocable in the bore mount. The screw 520 has a threaded portion 52! (Figure 8), with threads complementary. to those of the wedge, and a threaded portion 54 of smaller diameter which has threads complementary to those of the mount. In this particular instan-cethe threads are reversed in direction,

Rotation of the screw in one direction will vdraw the wedge into binding engagement with the tool element, and rotation of the screw in the opposite direction will force the wedge from binding engagement, while retaining it in operative proximity to the flattened surface 5| 0! the tool element, whereby to secure the tool element against rotation even at such times as the tool ele'mentis free for longitudinal adjustment.

The screw is'socketedati55 (Figure 6) to receive a wrench for its manipulation. v

In addition to the hole provided in the mount in which the screw portion 54 operates and through which it is accessible for manipulation, I may provide a registering opening at 51 in the carrier as suggested in'Figures 2 and 3, through which a screw driver slot in the larger end portion 52! of, the screw is accessible, so that the screw may be actuated to release the tool ior adjustment without removing the mount from the carrier. 2

As above suggested, where the carrier has ample room, I may pref-er the type of mount shown in Figures 12 to 15, and designated generically by reference character 240. The exterior outline of this mount is generally cylin-v drical so that the mount is receivable into a single. bored opening. The flange 400 which transmits thrust to the carrier may be annular, and may convenientlybe provided with recesses at 58 to receive bolts for fixing the mount in position in the carrier. It may, also, have the notch 43 already described,

The tool element 350 and its mounting in the bore 4111, subject to adjustment by manipulation of a screw 50, is all substantially similar in organization to the arrangement previously described. The wedge lock, however, instead of operating transversely with respect to the bore 410, operates longitudinally thereof and comprises the generally cylindrical wedge 480 adjustable in an opening 490 which is pitched at an acute angle toward the bore 410. The difi'erentially threaded screw 530 has its differently pitched and diametered threads engaged respectively with the wedge 480 and'with the. mount 240, so that when the screw is turned in a wedge tightening direction the respective flattened portions of the wedge and the tool element engage in the plane indicated at 59 to bind the tool in any adjusted pos tion.

This construction makes it unnecessary to provide an additional opening in the carrier through which the manipulation of the wedge lock screw 530 can be eflected. As shown in Figures 12 and 15, the end 01 the wedge lock screw is exposed in the mount directly adjacent the cutting tool.

I claim:

1. A device of the character described, com prising an elongated body provided with cylindrical'side portions and havingfa longitudinal= bore, a tool element reciprocably adjustable in said bore and projecting at one end therefrom, said body having thrust transmitting means pro jecting laterally and adapted to deliver both I radial and axial components of reaction thrust of said tool element to a carrier in which said tool mount body of elongated form provided with cylindrical side portions and having a longitudinallyextending bore and flanges projecting laterally from said body adjacent one end of said bore, of a tool element reciprocably adjustable in said bore and having one end projecting from said flanged tool mount portion, a screw threaded to said element and including a flanged head, said body including means 'co acting with said head to secure said screw against axial displacement respecting said body, and means in said body in axially disposed alignment with the tool element for locking said tool element in adjusted position, said locking means having a portion extending through the flange portion to provide adjustment means adjacent the propecting tooth portion. I

3. In a device of the character described, the combination with a tool mount body of elonlation at the end of the body opposite that from which the tool-element projects.

6. In adevice of the character described, a tool mount comprising an elongated body having cylindrical side portions and intervening noncylindrical side portions of flattened form, said body being provided with a longitudinally extending bore at one side of its center and a communicating bore at the other side of its center, a tool element projecting from the longitudinal bore and adjustable therein, a wedge adjustable in the communicating bore to and from binding engagement with said tool element, means for adjusting the wedge, and means for adjusting the tool element comprising a screw in threaded connection therewith and having means interlocked with said body against dis- I placement longitudinally thereof, said screw injustment.

gated form having a longitudinally extending bore offset at one side of the center of said body, atool element recipioca'blein said bore and projecting beyond one end of said body, means for adjusting said tool element in said bore, including an operating part accessible at the other end of said body, and means mounted unitarily in said body in the wider side thereof as measured from said bore, including a clamp engageable with said tool element for fixing the adjusted position thereof. i

4. In a device of the character described, the combination with a tool body. of elongated form adapted to be unitarily mounted in the slot of a tool carrier, said body having a'longitudinally extending bore offset at one side of the center thereof, and another bor disposed with, its axis at the opposite side of t e center of said body tool mount comprising an elongated body having cylindrical side portions and intervening noncluding an actuating part exposed for manipulation at the end of the body opposite that from which the tool element projects, said body having thrust transmitting flange means overhanging its non-cyindrical flattened side portions.

'7. A device of the character described, comprising a tool mount body of elongated form having fiat sides and spaced cylindrical sides and a longitudinal bore more nearly adjacent one of said cylindrical sides than the other, a tool element reciprocably adjustable in said bore, and a wedge lock mounted in said body beside said bore and engageable with said tool element for clampingit in a predetermined position of ad- 8. A device of the character described, comprising a tool -mount body of elongated form having flat sides and spaced cylindrical sides and a longitudinal bore more nearly adjacent one of said cylindrical sides than the other, a tool.

element reciprocably adjustable in said bore,

cylindrical side portions of flattened form, said i body being provided with a longitudinally extending bore at one side oi its" center and a communicating bore at the other side of its cen-- ter, a tool element projecting from the longitudinal bore and adjustabletherein, a wedge adjustablein the communicating bore to and from binding engagement with said tool element, means for adjusting the wedge,and means for adjusting the tool element comprising a screw in threaded, connection therewith and having means interlocked with said body against displacement longitudinally thereof, said screw inand a wedge lock mounted in said body beside said bore and engageable with said tool element for clamping it in a predetermined position of adjustment, sa d body having a transverse bore intersecting said first. mentioned bore and said wedge lock comprising a wedge reciprocable in the transyerse boreto and from engagement with said element, and a screw for controlling the position of said wedge.

9. In a device of the character described, a

tool mount .body of elongated form having {a longitudinal opening and a shorter longitud nally extending secondopening inclined to intersect said first opening, of a tool element longitudinally adjustable in the first opening, a wedge element longitudinallyxreciprocable in the second opening to and from binding engagement with said first element, and screw means for forcing said wedge into binding engagement with said tool element.

-10. A device of the character described, comprising a tool mount body of elongated form having cylindrical side portions and provided with intersecting longitudinally disposed bores both opening at one end of said body, a tool element reciprocable in one of said bores, a wedge reciprocable in the other of said bores, said element and wedge having surfaces in ,bearing contact, and screw means disposed between said wedge and body for adjusting said wedge respecting said tool element.

11. A device of the character described, comprising a tool mount body of elongated form having cylindrical side wall portions, a longi-. tudinal bore extending through said body from eluding an actuating part exposed for manipu- 7 one end to the other at one side of its center tion inclined with reference =tothe' first'bore; andcommunicatingtherewith; .a. toolceiemenizireciprocably adjustable in the first vboreiand:profleeting atone end of said' body, saidtool elementibeing provided with adjusting mechanism: exposed-1t the other end of said: firstbore-formanipulation;. a wedge in the inclinediboreahavingqabearing menfi, whereby; 1to-c1amprsaid w tool element "in a-- position of adjustmentrespectinrsaid bodyz' 12. In a rotatable: tool licarrierzj ha vinge a 1 tool mount removably sooifetedt thereimitiieacombinw E 'tion'. 0! fax; projection; onutheemount engageablewiththe carrierfto iimitimovement i'of' Zthe 1 mount in one direction": and? a screw havingirth11eaded engagement with tifecarrier 'and imovable against the: mount inns 'dirctiomzto rforcezthe" projection;

surface engaging said tooieiement;and-screw -:10 innpressureengagementiagainstithe carrier;

means in the. inclined boreaif or aotuatingi said; wedge with respect to said-bo'dyand mama 'e1'e'-= mwmmm 

